Fix controller mapping platform, player index sync, and socket errors (#251)

* Fix macOS controller platform, sync player indices, and preserve socket send error

- Preserve captured socket send error across diagnostic logging in network_socket.cpp
- Use SDL_GetPlatform() instead of hardcoded Windows in controller mapping wizard
- Synchronize Aurora and SDL player indices on port assignment and clear in pad.cpp
- Auto-assign Player 1 on macOS when unconfigured in input.cpp

* fix(input): refine macOS port 0 assignment and persistence logic

- Persist port 0 preference for newly connected controller even if already assigned player index 0
- Verify controller has no preference on other ports before assigning to port 0

(cherry picked from commit 85f250155f8f397c1c463dc51dd4dc2707371d06)
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011tcyLz63pXjoYEwsFjfg8F

runtime/src/controller_mapping_wizard.cpp

@@ -5,6 +5,7 @@
 #include <imgui.h>
 #include <SDL3/SDL_gamepad.h>
 #include <SDL3/SDL_joystick.h>
+#include <SDL3/SDL_platform.h>
 
 #include <algorithm>
 #include <array>
@@ -146,7 +147,7 @@ std::string BuildMappingString() {
             mapping += std::string(kSteps[i].mappingKey) + ":" + *g_wizard.bindings[i] + ",";
         }
     }
-    mapping += "platform:Windows,";
+    mapping += std::string("platform:") + SDL_GetPlatform() + ",";
     return mapping;
 }
 

runtime/src/hle/net/network_socket.cpp

@@ -467,7 +467,8 @@ int32_t HandleIpTopIoctlv(uint32_t cmd, const std::vector<IoVector>& in, const s
         const int ret = sendto(s->native, reinterpret_cast<const char*>(sendData), static_cast<int>(sendSize),
                                static_cast<int>(flags), destPtr, destLen);
         const int hostError = ret < 0 ? NativeLastError() : 0;
-        int32_t result = SocketResult(ret);
+        // Diagnostics may change the native error; use the send result captured above.
+        int32_t result = ret >= 0 ? SocketResult(ret) : SocketErrorResult(hostError);
         if (patchedWrite && ret == static_cast<int>(sendSize)) {
             result = static_cast<int32_t>(in[0].size);
         }